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Issue:ISSN 1000-7083
          CN 51-1193/Q
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Your Position :Home->Past Journals Catalog->2012 Vol.31 No.5

Biological Characteristics of Physa acuta and the Effects of Light on their Growth and Development
Author of the article:MA Jun-guo, LI Xiao-yu*
Author's Workplace:(School of Life Science, Henan Normal University, Xinxiang, Henan Province 453007, China)
Key Words:Physa acuta; biology; growth; reproduction; light
Abstract:

The freshwater snail Physa acuta (Draparnaud, 1805) are widely distributed in the world and are believed to be an invasive species in China. The morphological characteristics, reproduction, development and the effects of light on the growth of Physa acuta were studied in this paper. The results showed that the shell of Physa acuta was medium in size, sinistral, without epiphragm. Most of them inhabited in freshwater regions with abundance of nutrition and aquatic plants. Physa acuta were hermaphroditic and cross-fertilization, sometimes self-fertilization. In suitable conditions, maturity individual is able to spawn daily and the rate of hatching could reach 100%. The embryonic development went through the following seven stages: cleavagegastrulatrochophore larva, basin larvaaberdeen spiral formation and the hatching, which mainly finished within 7 to 10 days. The larva grew to sexual maturity after 60 days of hatching. The snail grew fast with light 24 hours a day at 25, and the larva became mature after 40 days of hatching under these conditions.

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